Do I need to hold the crown with firm pressure for the entire pre-gel stage?

After it had gelled, can I let go of the crown, or should I maintain pressure?

How about the feared interproximals? They can get messy if the cement cures too much, but flossing to early will likely cause bleeding. When is the right time to take care of this area? Do you recommend an explorer, a fresh piece of floss or a piece of floss that has been embedded prior to seating the restoration?

- Apply Simplicity as usual and light-activate for 10 seconds (facial and lingual in the anterior, facial, occlusal and lingual in the posterior)
- Apply another coat of Sim 2, but DO NOT LIGHT ACTIVATE